Safety device



May 7, 1929.

B. JONES SAFETY DEVICE Filed March 22, 1928 I Inventor $0712.22? Z/0;zes

0 being shown at 7 Patented May 7, 1929.

UNITED STATES BONNIE JONES, OF WYNONA, OKLAHOMA.

SAFETY DEVICE.

Application filed March 22, 1928.. Serial No. 263,787.

The present invention relates to a safety device for use more particularly in hooking a well 0% ofpower.

At the presenttime, the means for hooking the well off consists of wooden blocks, which necessitates the use of both hands and frequently considerable difficulty is experienced in properly positioning the blocks, and as a result, serious injury is sustained by the operator hooking olf the well.

It is therefore the principal aim of my invention to provide a device for hooking off wells, in a safe and positive manner, the safety device embodying my invention being simple in construction, inexpensive, strong and durable, and further well designed for the purpose intended.

Other objects of the invention will become apparent as the nature of the invention proceeds and when taken in connection with the accompanying drawing.

In the accompanying drawing, forming a part of this application and in which like numorals designate like parts throughout the several views:

Figure 1 is a longitudinal sectional view through the safety device embodying my invention, the movable tubular member being shown in a raised position.

Figure 2 is a cross sectional view, taken approximately on the line 2-2 of Figure 1.

In the drawing, wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates what is known as the knock-oil post, which is formed with an enlarged through opening, in which is secured the cylindrical casting 2, the same being formed at its upper end with a flange 3, that engages with the top of the knock off post and securing bolts 4 extend through the flange and the knock off post, in the manner as clearly shown in Figure 1, whereby the cylinder 2 is'secured in a stationary manner.

A pair of diametrically opposed locking dogs 5 are pivoted at their lower ends in suitable cut out portions 6 provided therefor in the inner face of the upper portion of the stationary cylinder 2, the pivots for these dogs Expansible coil springs 8 are associated with the upper free ends of the diametrically opposed dogs 5 and the adjacent portions of the respective cut-outportions 6 for nor mally urging the dogs 5 inwardly into the sorted through the cylinder.

bore of'the cylinder 2 and the purpose of these locking dogs will be presently described. Extending longitudinally through the stationary cylinder 2 and adapted forsliding and rotatable movement therein is the elongated tubular member 9, which is formed at its upper end with a laterally extending handle portion 10.

The pull rod 11 extends through the elongated tub ular member 9, the upper end of this pullrod having'the usual clamp or stirrup 12 secured on the same.

The tubular member 9 is termediate portion thereof'with diametrically opposed notches 13' in the outer face thereof for cooperation with the respective p voted dogs 5, and as is shown clearly in F igure 1, these notches graduallyincrease in depth from the upper to the lower ends thereof.

In assembling the safety device, the cylin-" der 2 is initially secured in the knock off post 1, after which the pull cord 11 is in The tubular member 9 is then slipped over the upper portion of the pull rod and the clamp or stirrup 12 is then secured on the upper portion the pull rod.

When thetubular member 9 is in its lowermost position, the handle portion 10 formed on the upper end of the tubular member will engage with the flange 3, as is readily obvious from the construction disclosed in Figure 1.

' W'hen it desired to hook the well off of power, the handle 10 is moved upwardly until the notches 13 are at the same level with'the pivoted dogs and when the well is on its upstroke, the tubular member 9 is turned a quarter of a turn, and on the down stroke of the well, the tubular member 9 will be checked by the dogs 5 being in engagement with the notches 13. The rod line hook will now drop, loose from the damper stirrup on the rod line, as well as all of the weight being taken off of the tower and resting on the knock off, I

The provision'of a safety device of this character will prevent serious injuries being sustained by the operator in hooking off a 'well, and furthermore, the device will, at all times be positive and efficient in carrying out the purpose for which it is designed.

WVhile I have shown the preferred embodiment of my invention, it is to be understood formed at the inthat minor changes in the size, shape, and arrangeinent of parts may be resorted to, without departing from the spirit of the invention and the scope of the appended claims.

Having thus described my invention, what I claim as new is:

1. In a safety device of the class described, a stationary cylinder, an elongated tubular member slidably and rotatably arranged in the cylinder and through which a pull rod is adapted to extend, the upper end of the pull rod engaging the upper end of the tubular member, a handle on the upper end of the tubular member for actuating the same, and complementary means between the cylinder and the tubular member for locking the latter in a raised position.

2. In a safety device of the class described, a stationary cylinder, an elongated tubular member slidably and rotatably arranged in the cylinder and through which a pull rod is adapted to extend, the upper end of the pull rod engaging the upper end of the tubular member, a handle on the upper end of the tubular member for actuating the same, and complementary means between the cylinder and the tubular member for locking the latter in a raised position, said means comprising a pair of diametrically opposed dogs arranged in cut-out portions formed in the inner wall of the cylinder, said dogs being pivoted at their lower ends, the tubular member being formed with a pair of diametrically opposed notches for cooperation with the respective dogs when the tubular member is in a predetermined position, and resilient means associated with the free ends of the dogs for normally urging thesame into the bore of the cylinder.

3. A safety device of the class described comprising a vertically disposed stationary cylinder for disposition in a knock off post, an elongated tubular member arranged for slidable and rotatable movement within the cylinder, and through which a pull rod extends, the upper end of the pull rod extending into the upper end of the tubular member, the intermediate portion of the tubular member being formed in its outer face with a pair of diametrically opposed notches, a pair of spring pressed locking pawls pivoted at their lower ends in the cut-out portion provided therefor in the inner face of the cylinder at diametrically opposed points for engagement with the respective notches to hold the tubular memher in a raised position when the notches are in alignment with the dogs, and a handle on the upper end ofthe tubular member for manually actuating the tubular member to disengage the tubular member from looking engagement with the dogs, said handle engaging the upper end of the cylinder to limit the downward sliding movement of the tubular member.

In testimony whereof I aflix my signature.

BONNIE JONES. 

